Plaster foundation



June 27, 1933. w F. SCHULZ PLASTER FOUNDATION Filed Jan. 17, 1931.

Patented June 27, 1933 UNITED STATES PATENT OFFICE WALTER F. SCHULZ, OF YOUNGSTOWN, OHIO, ASSIGNOR TO TRUSCON STEEL COMPANY,

Y OF YOUNGSTOWN, OHIO, A CORPORATION 0F MICHIGAN IPLASTER FOUNDATION REiSSUE-D Application led January 17, 1931. Serial No. 509,509.

One of the principal objects of the present invention is to provide a relatively inexpenslve form of structure of that type in which a backingsheet and an overlying foraminous sheet are employed, with means of a sulficlently effectivecharacter to secure the two together Vso as to permit their mounting on studding, rafters or other supports, and holdmg' the two in associated relation until plaster has been applied and has set.

A further object is to provide a structure of this character that eliminates the necessity of perforating the backing sheet with securing means, thereby obviating the places at which the moisture of the plaster can find access to the interior of the backing between the supports.- In other Words the necessity of breaking a waterproofed backing sheet at numerous points is eliminated.

The structure also obviates another serious difficulty. In the manufacture of these plaster bases, the plaster holding element is usually of expanded metal, and expanded metal is not and cannot always be produced with exact accuracy without material trouble and expense. The consequence is that the meshes will vary in size and shape, and

where the expanded metal and board are, united by machinerypand staples are em-1 ployed as the uniting agency, the lattice of the expanded metal will not always come accurately into place by reason of the aforesaid variations. In the present embodiment this serious difficulty is overcome and a structure can be produced by machinery, irrespective of discrepancies that may appear in the members.

. In the accompanying drawing:

Figure 1 is a view in elevation of a plaster base constructed in accordance with the y present invention. Figures 2 and 3 are respectively sectional views on the lines 2-2 and 3 3 of Figure 1.

Figure 4 is a detail View illustrating the preferred form of fastening the foundation in place on a support.

In the disclosure, a backing board is employed, preferably of corrugated fibre or paper. As shown it consists of a backing sheetA 5, a facing sheet 6, and an interposed plaster will corrugated core 7. This board, or at least the outer sheet 6, is substantially waterproofed.

Over the outer face of the outer sheet 6 is located a lathing sheet 8, which is preferably, though not necessarily, of expanded met-al. The expanded metal sheet 8 is secured to the backing sheet or board by strips 9 which may be of fabric, cord or some suitable non-metallic material, but preferably paper. These may be laid in any direction over the metal fabric 8, and in the openings are pressed down as will be clear by reference to Figure 2, so that at intervals they are in contact with the outer face of the outer sheet G, and these portions are secured by suitable adhesive to said backing board.

Preferably the strips are substantially waterproofed and the adhesive is waterproof. Silica `of soda has been found peculiarly effective for the purpose, not only because of its waterproof character, but because it dries quickly. Casein glue may be employed, and indeed it has been found that vegetable or animal glue or other adhesive can be satisfaetorily utilized since the moisture of the plaster docs not seem to pass readily between the adhering portions of the sheets, and the set before any separation can take place. More than that, the strips have really fulfilled their function after the plaster has been applied` for when it sets, experience has demonstrated that it will adhere to the backing sheet so as to be actually supported thereby. Moreover in the preferred use of the board the metal lathing is itself preferably fastened to the supports. Thus, as indicated in Figure 4, nails having large heads 10 are driven through the board into the studding 11 and overlies the metal.

It will be seen that with this structure the surface of the backing sheet is unbroken by fasteners passing through it, except at the studding where it is backed by the latter, and consequently there are no openings by which moisture can gain access to the interior of the backing sheet between its points of support. A structure of this kind moreover can be readily manufactured either by hand or by machinery, any variation in the arrangement 100 of the mesh of the metal lathing not a'ecting the application of the securing strips 9, which being flexible, will pass through the openings Whenever they occur.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art Without further description and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to Without departing from the spirit orsacrificing any of the advantages of the invention.

What I claim, is:

1. A plaster base comprising a backing sheet, foraminous material located thereover, and means extending over the foraminous material and adhesively applied to the outer face of the backing sheet at openings in the foraminous material and securing the foraminous material to the backing sheet.

2. A plaster base comprising a backing sheet, foraminous material located thereover, and a uniting strip extending over the outer side of the oraminous material and secured to the outer face of the backing strip in the openings of the foraminous material.

3. A. plaster base comprising a backing sheet having its outer face substantially Waterproofed, a foraminous metal sheet located over the said face of the sheet, and a plurality of flexible strips extending over the foraminous sheet and having portions thereof in the openings of the sheet adhesively secured to the backing sheet.

4. A plaster base comprising a backing sheet having its outer face substantially Waterproofed, a oraminous metal sheet located over the said face of the sheet, and a plurality of flexible substantially Waterproofed strips extending over the foraminous sheet and having portions thereof in the openings of the sheet secured to the Waterproofed face of the backing sheet by substantially waterproof adhesive. y y

In testimony whereof, I ailx my signature.

WALTER F. SCHULZ. 

